CONTENTS

A data pointer to pass to the write callback. If you use the
CURLOPT_WRITEFUNCTION(3) option, this is the pointer youll get in that
callbacks 4th argument. If you dont use a write callback, you must make
pointer a FILE * (cast to void *) as libcurl will pass this to
fwrite(3) when writing data.

The internal CURLOPT_WRITEFUNCTION(3) will write the data to the FILE *
given with this option, or to stdout if this option hasnt been set.

If youre using libcurl as a win32 DLL, you MUST use the
CURLOPT_WRITEFUNCTION(3) if you set this option or you will experience
crashes.

A common technique is to use the write callback to store the incoming data
into a dynamically growing allocated buffer, and then this
CURLOPT_WRITEDATA(3) is used to point to a struct or the buffer to store
data in. Like in the getinmemory example:
https://curl.haxx.se/libcurl/c/getinmemory.html